Which biome is characterized by weasels, gray wolves, ptarmigan, musk oxen, and lemmings?
a. tundra
b. desert
c. tropical rain forest
d. savanna
e. temperate deciduous forest
A
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Which of the following is a key component of the cytoskeleton?
a. centrosome b. microtubules c. DNA d. ribosomes e. endoplasmic reticulum
The only known source of human embryonic stem cells is:
a. placental tissue. b. umbilical cords. c. early human embryos. d. brain tissue. e. nerve tissue.
What was a significant outcome of the Miller and Urey experiment?
a. They demonstrated natural selection. b. They were the first to synthesize living cells. c. They proved that life did not originate on Earth. d. They proved that the iron-sulfur world hypothesis was false. e. They synthesized organic molecules from inorganic materials.
A 30-year-old woman was hospitalized after she experienced convulsions. On examination, she was alert and oriented and complained of a fever, headache, and stiff neck. Which of the following is most likely to provide rapid identification of the cause of her symptoms?
A) Gram stain of cerebrospinal fluid B) Gram stain of throat culture C) biopsy of brain tissue D) check serum antibodies E) None of these would provide rapid identification.